Rotary blowers



Sept. 11, 1962 G. J. MEYER 3,053,438

ROTARY BLOWERS Filed Aug. 29, 1960 2 Sheets-Sheet 1 Q B/ 0 k \35 I7 gl.

INVEIVmR GODFRIED J. MEYER fa /w? Au/ Sept. 11, 1962 G. J. MEYER 3,053,438

ROTARY BLOWERS Filed Aug. 29, 1960 2 Sheets-Sheet 2 [MENTOR GODFRIED u. MEYER United States Patent Ofiice 3,053,438 Patented Sept. 11, 1962 3,053,438 ROTARY BLOWERS Godfried John Meyer, 2035 W. 13th Ave., Vancouver 9, British Columbia, Canada Filed Aug. 29, 1960, Ser. No. 52,669 2 Claims. (Cl. 230-157) My invention relates to improvements in rotary blowers.

The objects of the invention are to provide a blower which is capable of being driven at extremely high speeds so that the velocity of the air being discharged from the blower is greater than the output achieved by the conventional blowing devices.

Further and important objects are to provide means whereby the device may be run at high speeds without excessive wear to the blower parts and to ensure that the air is discharged from the blower at a minimum temperature.

These and other objects will appear in the following specification and be shown in the accompanying drawings.

Referring to the drawings:

FIGURE 1 is a vertical section taken on line 11 of FIGURE 2.

FIGURE 2 is a similar section taken on line 22 of FIGURE 1.

FIGURE 3 is a fragmentary elevation of the blower rotor.

FIGURE 4 is a section taken on line 44 of FIG- URE 3.

In the drawings like characters of reference indicate corresponding parts in each figure.

The numeral indicates a cylindrical casing having a peripheral wall 11, a fixed end wall 12 and a removable end wall 14. On the top of the casing 10-, an air inlet 16 is provided and extending from the underside of said casing is an air outlet 17. The longitudinal axis of the casing is indicated by the letter A and the wall 12 has a flanged opening 20 which is spaced a short distance below said axis. A similar flanged opening 21 is provided in the wall 14, which opening is aligned with the opening 20.

Mounted within the casing 10 is a stator 24 having a cylindrical body 25 and horizontally extending spindles 26 and 27. The stator spindles have a common axis B which is eccentrically disposed to the periphery 28 of the body 25. The spindle 26 is received in the opening 20 and is engaged by a grub screw 29 so as fixedly to secure the stator within the casing. When secured in this position the periphery 28 of the stator is concentric to the peripheral wall 11 of the casing. The periphery 28 has a substantially T-shaped recess 31 which forms a pair of opposing cam tracks 32.

The stator 24 is fitted with a plurality of blades 34 which are flat, rectangular members having outer edges 35 and side edges 36. A centrally disposed tongue 37 is provided on each blade 34 and carried on the inner end of said tongue is a shaft 38. The projecting ends of the shaft 38 are fitted with rollers 39 which ride in the cam tracks 32. v

The blower 10 is fitted with a rotor 41 having a hollow cylindrical body which encloses the stator 24 and said rotor has an end plate 42 which is rotatably mounted on the spindle 26 as at 44. A second end plate 45 is provided on the rotor and this end plate is fitted with a tubular driven shaft 46 which is journalled as at 47 in the flanged opening 21 of the casing end wall 14. In FIG- URE 2 it is shown that the stator spindle 27 is received in the inner end of the tubular shaft 46 and that said shaft rotates around the spindle upon a bearing 49.

The end plates 42 and 45 are provided with a number of slots 50 which are radial to the axis B and in which the blades 34 are received during part of their rotary movement. The opposing faces of the end plates are rebated as at 51 and seated in said rebates are a plurality of connecting segments 52 which are identical in form and are equidistantly spaced apart. Each segment 52 has an arcuate outer face 53 and tapered sides 54 and formed on said segments are transversely spaced tongues 55 which seat in the rebates 51. As shown in FIGURE 3 only the segments 52 are secured to the end plates 42 and 45 by suitably located fastening members 56 so as to form a rigid unitary structure which is eccentrically mounted with respect to the casing 10 and the body 25 of the stator.

The sides 54 of the segments define slots 58 which register with the slots 50 formed in the rotor end plates. The blades 34 project through the slots 58 and are engaged by suitably spaced roller bearings 60. As shown best in FIGURE 4 the bearings 60 are mounted upon inserts 61 which are secured to the sides 54 of the rotor segments.

In operating the rotary blower the driven shaft 46 is coupled to a drive motor and the rotor is driven thereby, preferably at very high speed. As the eccentrically mounted rotor is rotated within the blower casing in the direction of the arrow C of FIGURE 1 the blades 34 sweep past the inlet 16 to draw in air and discharge it at a high velocity through the outlet 17. Since the blades are moved around a concentric stator by an eccentric rotor the blades move relative to the rotor as they revolve within the casing or in other words the blades reciprocate to a slight extent in the slots 50 and 58. In addition to this movement, the spacing of the blades changes as rotation takes place and this is brought about by the fact that the blades are being moved by the rotor turning about the axis B while their rollers ride in the track centered on the axis A.

As shown in FIGURE 1 the spacing between the blades progressively decreases as the blades sweep past the inlet 16 and travel towards the outlet 17 and in the same manner the spacing increases from the outlet to the inlet. Thus a scissor-like action is imparted to the blades which has been found to greatly increase the velocity of the air being discharged from the device.

During operation of the blower the blades 34 are moved outwardly by centrifugal force so that the rollers 39 are held in firm contact with the cam tracks 32. At this time the outer edges 35 of the blades are spaced a short distance, say .010 of an inch, from the peripheral wall 11 of the casing and are therefore not subjected to wear. It will be noted that the side edges 36 of the blades are similarly spaced from the casing walls 12 and 14 so as to ensure cooler operating temperatures at the high speed at which the rotary blower is driven.

What I claim is:

1. A rotary blower comprising a cylindrical casing having a peripheral wall and Opposing end walls, said walls defining within the inner surface of the peripheral wall a pumping chamber, said peripheral Wall having an inlet and an outlet communicating with the pumping chamber, a cylindrical stator within the casing mounted concentrically to the inner surface of said casing, said stator having a pair of coaxial spindles eccentrically disposed to the periphery of said stator, said pair of spindles being integral with the stator and disposed one each on the opposite side thereof, one of said pair of spindles being fixedly secured to an adjoining casing end wall, a track formed on the periphery of the stator, rectangular blades carried by the stator and extending outwardly therefrom in closely spaced relation to the adjoining peripheral and end walls of the casing, a roller mounted on the radial inner end of each blade and engaging the track, a hollow cylindrical rotor enclosing the stator and being eccentric to the inner surface of the casing peripheral wall, said rotor having a pair of end plates one each journalled on each of the stator pair of spindles and a hollow driven shaft journalled in a casing end wall, one of said pair of spindles being journalled in said driven shaft, one of the pair of end plates having a tubular driven shaft journalled in a casing end wall and extending outwardly therefrom, said rotor having circumferentially arranged segments eccentrically disposed with respect to the casing and the stator, said segments having side faces spaced apart on an axial projection to define slots through which the blades extend and roller bearings carried by each of the segment side faces to slidably support the blades in the slot.

2. A rotary blower as claimed in claim 1, wherein the blades are radially disposed with respect to the axis of rotation of the rotor.

References Cited in the file of this patent UNITED STATES PATENTS 1,042,596 Pearson Oct. 29, 1912 1,666,466 Peters Apr. 17, 1928 2,033,218 Yirava Mar. 10, 1936 2,048,825 Smelser July 28, 1936 2,071,799 Mabille Feb. 23, 1937 2,536,938 Hunter Jan. 2, 1951 FOREIGN PATENTS 458,384 Germany Apr. 5, 1958 661,734 Great Britain Nov. 28, 1951 

